Tub bracing question

[99-LS1-SS]

I'm slowly amassing enough parts to start cutting my Blazer tub up and replacing parts and panels on it. I have a few questions though.

I still have the top on so that isn't an issue. I have taken the doors off though.

1. Should I mount the doors before bracing?

2. Should I brace the door opening at the top and bottom since I'm going to cut the rockers and some of the floor pan out?

3. Should I replace the body mount bushings before bracing?

4. I also have all of the front body panels and radiator support removed. I don't think that will affect the doors shutting but I thought I should ask first. Will affect the door alignment?

5. I have a new tailgate that I'm going to put on the truck. Should I put the new tailgate on before I brace it or does it matter?

I apologize if these are dumb questions but this is my first time doing a "restore" on this scale.

Thanks.